Dr. Ziegler
Hello! Doctor Ziegler, is it? I'm the Doctor.
The answer is yes, there are some alien lifeforms. Two, at least. Myself and...my other self. We don't need much looking after - we're a hardy lot. Oooh, that makes us sound like a plant.
Anyway, we bounce back quickly. Only thing to keep in mind if you ever see me in need of care - I've got two hearts to account for.
Let me know if you need anything. I'm handy in tricky situations.